/*
* Copyright (C) 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gxp.compiler.depend;
import com.google.common.collect.ImmutableMap;
import com.google.gxp.compiler.CompilationManager;
import com.google.gxp.compiler.CompilationSet;
import com.google.gxp.compiler.CompilationTask;
import com.google.gxp.compiler.CompilationUnit;
import com.google.gxp.compiler.base.Callable;
import com.google.gxp.compiler.base.TemplateName;
import java.util.Map;
import java.util.Set;
/**
* A graph of DependencyNode instances.
*/
@SuppressWarnings("serial") // let java pick the SerialVersionUID
public class DependencyGraph implements CompilationManager {
private final Map<TemplateName.FullyQualified, DependencyNode> nodes;
public DependencyGraph(CompilationSet cSet) {
ImmutableMap.Builder<TemplateName.FullyQualified, DependencyNode> mapBuilder =
ImmutableMap.builder();
for (CompilationUnit unit : cSet.getCompilationUnits()) {
Set<Callable> requirements = getRequirements(unit);
TemplateName.FullyQualified name = unit.getTemplateName();
DependencyNode node = new DependencyNode(name, getLastModified(unit),
requirements);
mapBuilder.put(name, node);
}
this.nodes = mapBuilder.build();
}
private Set<Callable> getRequirements(CompilationUnit unit) {
return unit.getBoundTree().getRequirements();
}
private static long getLastModified(CompilationUnit unit) {
return unit.getSourceFileRef().getLastModified();
}
// implements CompilationManager
public boolean sourceChanged(CompilationTask task) {
CompilationUnit unit = task.getCompilationUnit();
DependencyNode node = nodes.get(unit.getTemplateName());
if (node != null) {
long oldTimestamp = node.getLastModified();
if (oldTimestamp > 0L) {
return oldTimestamp != getLastModified(unit);
}
}
// We never saw the file before or couldn't get a reliable timestamp,
// so play it safe.
return true;
}
// implements CompilationManager
public boolean usedInterfacesChanged(CompilationTask task) {
CompilationUnit unit = task.getCompilationUnit();
DependencyNode node = nodes.get(unit.getTemplateName());
if (node != null) {
Set<Callable> oldRequirements = node.getRequirements();
return !oldRequirements.equals(getRequirements(unit));
}
// We never saw the file before so play it safe.
return true;
}
}